This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A302123 #17 Jan 05 2020 13:01:48 %S A302123 2,3,4,7,8,9,33,138,251,467,489,9894 %N A302123 Numbers k such that 6*k^k - 5 is prime. %C A302123 a(13) > 50000. - _Robert Price_, Jan 04 2020 %t A302123 Select[Range[1, 1000], PrimeQ[6*#^# - 5] &] (* _Vaclav Kotesovec_, Apr 02 2018 *) %o A302123 (PARI) for(n=0, 300, if(isprime(6*n^n-5), print1(n", "))) %Y A302123 Numbers k such that b*k^k - b + 1 is prime: A301521 (b=4), this sequence (b=6). %Y A302123 Cf. A302090, A302124. %K A302123 nonn,more,hard %O A302123 1,1 %A A302123 _Seiichi Manyama_, Apr 01 2018 %E A302123 a(10)-a(11) from _Vaclav Kotesovec_, Apr 02 2018 %E A302123 a(12) from _Robert Price_, Jan 04 2020